Separability of mixed states: necessary and sufficient conditions

@article{Horodecki1996SeparabilityOM,
  title={Separability of mixed states: necessary and sufficient conditions},
  author={Michal Horodecki and Paweł Horodecki and Ryszard Horodecki},
  journal={Physics Letters A},
  year={1996},
  volume={223},
  pages={1-8}
}
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